85 K % Blazer

[zredleg]

Ok
Here goes, I was driving home last night and the headlights, blinkers and interior lights start going on and off while I am driving. I stopped, turned the switch on and off, turned the vehicle off and restarted. The problem continued till I got home. Any suggestions on where to start trouble shooting???
Peter

 

[herkdriver007]

Bad grounds?

 

[Fordum]

Sounds like the breaker in the light switch is tripping. If you have upgraded any lights recently, you may have to add a relay because you have exceeded the breaker's trip point.

Otherwise, wait until dark, go out and try just the parking lights first. Turn them on and walk around looking for one that is out or dim.
If not, go full lights and do the same.
You are looking for a shorted socket, lamp filament, or wire.

If they all look good, consider replacing the light switch. The breaker and switch contacts do get old.
The only way to test it would be to measure the current draw coming into the switch, and I don't know what the max the breaker is set at.